import { getTimestampFromSeconds } from '@viewtube/shared';

export const useFormatting = () => {
  return {
    /**
     *
     * Get a timestamp from number of seconds.
     *
     * @param seconds
     * @returns timestamp
     */
    getTimestampFromSeconds,

    /**
     * Format bytes as human-readable text.
     *
     * @param bytes Number of bytes.
     * @param si True to use metric (SI) units, aka powers of 1000. False to use
     *           binary (IEC), aka powers of 1024.
     * @param dp Number of decimal places to display.
     *
     * @returns filesize
     */
    humanizeFileSize: (bytes: number, si = false, dp = 1): string => {
      const thresh = si ? 1000 : 1024;

      if (Math.abs(bytes) < thresh) {
        return bytes + ' B';
      }

      const units = si
        ? ['kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']
        : ['KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
      let u = -1;
      const r = 10 ** dp;

      do {
        bytes /= thresh;
        ++u;
      } while (Math.round(Math.abs(bytes) * r) / r >= thresh && u < units.length - 1);

      return bytes.toFixed(dp) + ' ' + units[u];
    }
  };
};
